US20220325652A1 - Automotive engine exhaust system - Google Patents
Automotive engine exhaust system Download PDFInfo
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- US20220325652A1 US20220325652A1 US17/716,145 US202217716145A US2022325652A1 US 20220325652 A1 US20220325652 A1 US 20220325652A1 US 202217716145 A US202217716145 A US 202217716145A US 2022325652 A1 US2022325652 A1 US 2022325652A1
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- pipe
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- metal pipes
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- 239000002184 metal Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims description 9
- 230000003197 catalytic effect Effects 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 239000010963 304 stainless steel Substances 0.000 claims description 4
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/04—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more silencers in parallel, e.g. having interconnections for multi-cylinder engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/16—Selection of particular materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
- F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
- F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
- F01N13/1844—Mechanical joints
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/02—Branch units, e.g. made in one piece, welded, riveted
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2340/00—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
- F01N2450/22—Methods or apparatus for fitting, inserting or repairing different elements by welding or brazing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/02—Branch units, e.g. made in one piece, welded, riveted
- F16L41/03—Branch units, e.g. made in one piece, welded, riveted comprising junction pieces for four or more pipe members
Definitions
- This invention relates in general to exhaust piping systems for internal combustion engines, in particular for automotive engines.
- metal piping is used to direct hot exhaust gases away from the engine, typically through a catalytic converter, to a muffler, and then out into the atmosphere through a tail pipe located at a rear or side of the automobile.
- a catalytic converter typically through a catalytic converter
- a muffler typically through a muffler
- a tail pipe located at a rear or side of the automobile.
- the design of an exhaust system affects not only the power output of the engine, but also the sound of the engine through the exhaust system, which can be an important quality for some vehicle owners and drivers.
- the present invention provides a generally X-shaped pipe that is particularly well-suited for installation in a “cat-back” exhaust system (i.e., that portion of the exhaust system located downstream of the catalytic converter) for a Cadillac ATS-V with turbocharged V6 engine, and for similar vehicular applications.
- a “cat-back” exhaust system i.e., that portion of the exhaust system located downstream of the catalytic converter
- a Cadillac ATS-V with turbocharged V6 engine i.e., that portion of the exhaust system located downstream of the catalytic converter
- V6 engine i.e., that portion of the exhaust system located downstream of the catalytic converter
- X-pipe X-shaped pipe
- an X-pipe for an automotive engine exhaust system is made from a pair of 3-inch diameter metal pipes, such as constructed from grade 304 stainless steel.
- Each pipe is formed to have an oval-shaped central opening with an outer length of about 7.5 inches and an inner length of about 7.15 inches.
- the two pipes are welded together along a central plane at the oval-shaped central openings.
- Each pipe has a central bend of about 48 degrees bent along a 5-inch radius and away from the oval-shaped central openings, and also a pair of opposite bends extending away from the central bends.
- the opposite bends extend along about 24 degrees of curvature along a 5-inch radius, opposite to the bend direction of the respective central bends, so that gas flowing through opposing ends of the pipes will flow approximately parallel to the central plane where the oval-shaped central openings meet.
- a method for forming and installing an X-pipe into an automotive engine exhaust system.
- the method includes forming two metal pipes with three bends in each, cutting an oval-shaped opening in a midsection of each pipe, and mating the pipes together at their openings.
- a central bend of about 48 degrees is formed in each pipe by bending the pipes along a 5-inch radius.
- a pair of opposite bends of about 24 degrees are formed along 5-inch radii.
- the oval-shaped central openings are formed along an outer radius of the central bend in each of the metal pipes such that respective opposite end portions of the metal pipes curve away from the central openings.
- the central openings each having an outer length of about 7.5 inches and an inner length of about 7.15 inches.
- the metal pipes are aligned with their respective oval-shaped central openings placed together along a central plane, where they are welded together to form the X-pipe.
- the opposite ends of the metal pipes of the X-pipe are then welded to respective ones of two upstream pipe ends and the two downstream pipe ends of a cat-back exhaust system for a vehicle.
- FIG. 1 is a top perspective view of an X-pipe automotive engine exhaust system of the present invention
- FIG. 2 is a side perspective view of one half of the X-pipe of FIG. 1 , shown partially formed;
- FIG. 3 is a top plan view of the X-pipe of FIG. 1 ;
- FIG. 4 is a side elevation view of the half of the X-pipe of FIG. 2 ;
- FIG. 5 if a top plan view of the half of the X-pipe of FIG. 4 .
- an X-shaped exhaust pipe section or “X-pipe” 10 ( FIGS. 1-5 ) is provided for installation or use within a full cat-back exhaust system, which is that portion of an internal combustion engine's exhaust system that is located downstream of a catalytic converter.
- X-pipe X-shaped exhaust pipe section or “X-pipe” 10
- FIGS. 3 and 4 which are marked in inches, depict such a system optimized for use in a cat-back exhaust system for a twin-turbocharged 3.6 L V6 LF4 engine fitted to a Cadillac ATS-V.
- the X-pipe 10 which includes a crossover or mixing region as describe below, reduces rasp on startup, harmonizes exhaust flow between the cylinder banks on the V6 turbo charged engine and to improve tonal pleasantness of the exhaust note.
- the various angles, curvatures, and marked dimensions are optimized for being fitted to a Cadillac ATS-V cat-back system in the rear of the exhaust tunnel, near the rear differential.
- Suitable cat-back exhaust systems are available, for example, from ZZ Performance, LLC, of Wyoming, Mich.
- the vehicle's stock exhaust is removed and a suitable cat-back exhaust system including the X-pipe 10 is installed in its place.
- the X-pipe 10 may be located approximately 68 inches straight-line distance and approximately 81 inches of pipe length from the OEM catalytic converters. It has been found that placing the X-pipe 10 further upstream (closer to the catalytic converters) or further back (closer to the tail pipes) in the ATS-V cat-back system may lead to less desirable tonal qualities.
- the X-pipe 10 is made from two bent tubes 12 of 304 stainless steel, which are bent on a 5.0 inch center line radius (“CLR”), and which are each cut to have an oval-shaped open region 14 along a central portion thereof.
- CLR center line radius
- the two bent tubes 12 each have three (3) bends for a total of six (6) bends in the tubes of the finished X-pipe 10 .
- Four (4) of the bends (at the opposite inlet and outlet ends) are at 24 degrees and two (2) of the bends (at the center) are at 48 degrees.
- the overall length of the X-pipe 10 optimized for the application noted above, is 14.25′′. As shown in only FIG.
- the finished X-pipe 10 may be formed with outwardly-flared tube ends to facilitate insertion of exhaust pipe portions of the vehicle's stock exhaust, prior to welding.
- the X-pipe 10 has five (5) TIG-welded joints including an oval-shaped weld 16 where the two oval-shaped open regions 14 of the two bent tubes 12 meet, and one weld at each of the open flared tube ends that receive respective exhaust pipe portions of the vehicle's cat-back exhaust system.
- X-pipe 10 may be manufactured by bending the 3-inch diameter metal pipes 12 to create a central bend of about 48 degrees along a 5-inch radius. A pair of end bends are then formed in the opposite direction of the central bend. The end bends are each about 24 degrees of curvature bent along another 5-inch radius, so that the opposite ends of each metal pipe are approximately parallel to one another.
- the oval-shaped central openings 14 are then formed along the outer radius of the central bend in each of the metal pipes such that respective opposite end portions of the metal pipes curve away from the central openings. In a preferred embodiment, the central openings each have an outer length of about 7.5 inches and an inner length of about 7.15 inches.
- the metal pipes 12 are then aligned with their respective oval-shaped central openings 14 placed together along a central plane. The metal pipes 12 are then welded together where they meet at the oval-shaped central openings 14 along the central plane, thus forming X-pipe 10 .
- the pipe ends are flared outwardly to receive 3-inch pipe ends of an automotive exhaust system.
- X-pipe 10 may be installed into the automotive engine exhaust system by cutting adjacent sections of two exhaust pipes out of the cat-back portion of the engine exhaust system. These cuts leave two upstream pipe ends and two downstream pipe ends.
- the opposite ends of the metal pipes 12 of the X-pipe 10 receive respective ones of the upstream pipe ends and the downstream pipe ends of the cat-back system.
- the formed X-pipe 10 dimensions for the formed X-pipe 10 are shown in inches in FIG. 3
- dimensions for one of the bent tubes 12 , including the oval-shaped open region 14 are shown in inches in FIG. 4 .
- the combinations of tube diameter, overall length, and the dimensions of the oval-shaped open region 14 where exhaust gases from respective banks of engine cylinders meet and mix, eliminates stock exhaust “rasp” (a harsh metallic sound) on startup and improves sound tone under driving load.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Exhaust Silencers (AREA)
Abstract
An X-pipe for an automotive engine exhaust system is made from a pair of 3-inch diameter metal pipes, each formed with a central bend and a pair of outboard bends. Each pipe is formed to have an oval-shaped central opening, and the two pipes are welded together along a central plane at the oval-shaped central openings. The resulting X-pipe may then be welded into an exhaust system and then installed on a vehicle with an internal combustion engine, and reduces rasp on startup, harmonizes exhaust flow between the cylinder banks on the engine, and improves tonal pleasantness of the exhaust note.
Description
- The present application claims the benefit of U.S. provisional application Ser. No. 63/173,349, filed Apr. 9, 2021, which is hereby incorporated herein by reference in its entirety.
- This invention relates in general to exhaust piping systems for internal combustion engines, in particular for automotive engines.
- For automobiles with internal combustion engines, metal piping is used to direct hot exhaust gases away from the engine, typically through a catalytic converter, to a muffler, and then out into the atmosphere through a tail pipe located at a rear or side of the automobile. In the case of high performance vehicles, the design of an exhaust system affects not only the power output of the engine, but also the sound of the engine through the exhaust system, which can be an important quality for some vehicle owners and drivers.
- The present invention provides a generally X-shaped pipe that is particularly well-suited for installation in a “cat-back” exhaust system (i.e., that portion of the exhaust system located downstream of the catalytic converter) for a Cadillac ATS-V with turbocharged V6 engine, and for similar vehicular applications. As compared to the stock (unmodified) exhaust system installed by the vehicle manufacturer, installation of the X-shaped pipe (“X-pipe”) of the present invention reduces “raspy” sound on startup, harmonizes exhaust flow between the cylinder banks (three cylinders feed into each pipe of the X-pipe), and improves tonal pleasantness of the exhaust note.
- In one form of the present invention, an X-pipe for an automotive engine exhaust system is made from a pair of 3-inch diameter metal pipes, such as constructed from grade 304 stainless steel. Each pipe is formed to have an oval-shaped central opening with an outer length of about 7.5 inches and an inner length of about 7.15 inches. The two pipes are welded together along a central plane at the oval-shaped central openings. Each pipe has a central bend of about 48 degrees bent along a 5-inch radius and away from the oval-shaped central openings, and also a pair of opposite bends extending away from the central bends. The opposite bends extend along about 24 degrees of curvature along a 5-inch radius, opposite to the bend direction of the respective central bends, so that gas flowing through opposing ends of the pipes will flow approximately parallel to the central plane where the oval-shaped central openings meet.
- According to another form of the present invention, a method is provided for forming and installing an X-pipe into an automotive engine exhaust system. The method includes forming two metal pipes with three bends in each, cutting an oval-shaped opening in a midsection of each pipe, and mating the pipes together at their openings. A central bend of about 48 degrees is formed in each pipe by bending the pipes along a 5-inch radius. At each opposite end of each of the metal pipes, and outboard of the central bends, a pair of opposite bends of about 24 degrees are formed along 5-inch radii. As a result, the opposite ends of each of the metal pipes are approximately parallel to one another. The oval-shaped central openings are formed along an outer radius of the central bend in each of the metal pipes such that respective opposite end portions of the metal pipes curve away from the central openings. Preferably, the central openings each having an outer length of about 7.5 inches and an inner length of about 7.15 inches. The metal pipes are aligned with their respective oval-shaped central openings placed together along a central plane, where they are welded together to form the X-pipe. The opposite ends of the metal pipes of the X-pipe are then welded to respective ones of two upstream pipe ends and the two downstream pipe ends of a cat-back exhaust system for a vehicle.
- These and other objects, advantages, purposes and features of the present invention will become apparent upon review of the following specification in conjunction with the drawings.
-
FIG. 1 is a top perspective view of an X-pipe automotive engine exhaust system of the present invention; -
FIG. 2 is a side perspective view of one half of the X-pipe ofFIG. 1 , shown partially formed; -
FIG. 3 is a top plan view of the X-pipe ofFIG. 1 ; -
FIG. 4 is a side elevation view of the half of the X-pipe ofFIG. 2 ; and -
FIG. 5 if a top plan view of the half of the X-pipe ofFIG. 4 . - Referring now to the drawings and the illustrative embodiments depicted therein, an X-shaped exhaust pipe section or “X-pipe” 10 (
FIGS. 1-5 ) is provided for installation or use within a full cat-back exhaust system, which is that portion of an internal combustion engine's exhaust system that is located downstream of a catalytic converter. In particular, the dimensions shown inFIGS. 3 and 4 , which are marked in inches, depict such a system optimized for use in a cat-back exhaust system for a twin-turbocharged 3.6 L V6 LF4 engine fitted to a Cadillac ATS-V. TheX-pipe 10, which includes a crossover or mixing region as describe below, reduces rasp on startup, harmonizes exhaust flow between the cylinder banks on the V6 turbo charged engine and to improve tonal pleasantness of the exhaust note. The various angles, curvatures, and marked dimensions are optimized for being fitted to a Cadillac ATS-V cat-back system in the rear of the exhaust tunnel, near the rear differential. Suitable cat-back exhaust systems are available, for example, from ZZ Performance, LLC, of Wyoming, Mich. In one advantageous arrangement the vehicle's stock exhaust is removed and a suitable cat-back exhaust system including theX-pipe 10 is installed in its place. In the Cadillac ATS-V application theX-pipe 10 may be located approximately 68 inches straight-line distance and approximately 81 inches of pipe length from the OEM catalytic converters. It has been found that placing theX-pipe 10 further upstream (closer to the catalytic converters) or further back (closer to the tail pipes) in the ATS-V cat-back system may lead to less desirable tonal qualities. - The
X-pipe 10 is made from twobent tubes 12 of 304 stainless steel, which are bent on a 5.0 inch center line radius (“CLR”), and which are each cut to have an oval-shapedopen region 14 along a central portion thereof. As best shown inFIGS. 1 and 3 , the twobent tubes 12 each have three (3) bends for a total of six (6) bends in the tubes of the finishedX-pipe 10. Four (4) of the bends (at the opposite inlet and outlet ends) are at 24 degrees and two (2) of the bends (at the center) are at 48 degrees. The overall length of theX-pipe 10, optimized for the application noted above, is 14.25″. As shown in onlyFIG. 1 , the finishedX-pipe 10 may be formed with outwardly-flared tube ends to facilitate insertion of exhaust pipe portions of the vehicle's stock exhaust, prior to welding. Once installed into the cat-back system, theX-pipe 10 has five (5) TIG-welded joints including an oval-shaped weld 16 where the two oval-shapedopen regions 14 of the twobent tubes 12 meet, and one weld at each of the open flared tube ends that receive respective exhaust pipe portions of the vehicle's cat-back exhaust system. - X-pipe 10 may be manufactured by bending the 3-inch
diameter metal pipes 12 to create a central bend of about 48 degrees along a 5-inch radius. A pair of end bends are then formed in the opposite direction of the central bend. The end bends are each about 24 degrees of curvature bent along another 5-inch radius, so that the opposite ends of each metal pipe are approximately parallel to one another. The oval-shapedcentral openings 14 are then formed along the outer radius of the central bend in each of the metal pipes such that respective opposite end portions of the metal pipes curve away from the central openings. In a preferred embodiment, the central openings each have an outer length of about 7.5 inches and an inner length of about 7.15 inches. Themetal pipes 12 are then aligned with their respective oval-shapedcentral openings 14 placed together along a central plane. Themetal pipes 12 are then welded together where they meet at the oval-shapedcentral openings 14 along the central plane, thus formingX-pipe 10. - Optionally, the pipe ends are flared outwardly to receive 3-inch pipe ends of an automotive exhaust system. X-pipe 10 may be installed into the automotive engine exhaust system by cutting adjacent sections of two exhaust pipes out of the cat-back portion of the engine exhaust system. These cuts leave two upstream pipe ends and two downstream pipe ends. The opposite ends of the
metal pipes 12 of theX-pipe 10 receive respective ones of the upstream pipe ends and the downstream pipe ends of the cat-back system. - Dimensions for the formed
X-pipe 10 are shown in inches inFIG. 3 , and dimensions for one of thebent tubes 12, including the oval-shapedopen region 14, are shown in inches inFIG. 4 . In addition to the desirable installation location of theX-pipe 10 in the cat-back system described above, the combinations of tube diameter, overall length, and the dimensions of the oval-shapedopen region 14, where exhaust gases from respective banks of engine cylinders meet and mix, eliminates stock exhaust “rasp” (a harsh metallic sound) on startup and improves sound tone under driving load. - Changes and modifications in the specifically described embodiments may be carried out without departing from the principles of the present invention, which is intended to be limited only by the scope of the appended claims, as interpreted according to the principles of patent law including the doctrine of equivalents.
Claims (12)
1. An X-pipe for an automotive engine exhaust system, said X-pipe comprising:
a pair of 3-inch diameter pipes each having an oval-shaped central opening having an outer length of about 7.5 inches and an inner length of about 7.15 inches, wherein said pipes are welded together along a central plane at said oval-shaped central openings;
each of said pipes having a central bend of about 48 degrees bent along a 5-inch radius and away from said oval-shaped central openings;
each of said pipes each having a pair of opposite bends extending away from said central bends so that gas flowing through opposing ends of said pipes flows approximately parallel to said central plane where said oval-shaped central openings meet, where each of said opposite bends is about 24 degrees bent along a 5-inch radius.
2. The X-pipe of claim 1 , wherein said pipes comprise 304 stainless steel.
3. The X-pipe of claim 1 , wherein said pipes are spaced apart by about 0.75 inch at respective ones of said opposing ends.
4. The X-pipe of claim 1 , wherein said pipes have an overall pre-installed length of about 14.25 inches.
5. The X-pipe of claim 1 , wherein said opposing ends of said pipes are welded into a cat-back exhaust system at a rear end portion of an exhaust tunnel, proximate to a rear differential of a vehicle comprising a Cadillac ATS-V equipped with twin-turbocharged 3.6 L LF4 V6 engine.
6. The X-pipe of claim 5 , wherein said opposing ends of said pipes are positioned about 81 inches of pipe length downstream from a catalytic converter of said vehicle.
7. A method of forming and installing an X-pipe into an automotive engine exhaust system, said method comprising:
forming, in each of two 3-inch diameter metal pipes, a central bend of about 48 degrees bent along a 5-inch radius;
forming, at each opposite end of each of the metal pipes and outboard of the central bends, a pair of opposite bends of about 24 degrees bent along a 5-inch radius, wherein the opposite ends of each of the metal pipes are approximately parallel to one another.
forming an oval-shaped central opening along an outer radius of the central bend in each of the metal pipes such that respective opposite end portions of the metal pipes curve away from the central openings, the central openings each having an outer length of about 7.5 inches and an inner length of about 7.15 inches;
aligning the metal pipes with their respective oval-shaped central openings placed together along a central plane;
welding the metal pipes together where they meet at the oval-shaped central openings along the central plane to form the X-pipe; and
welding the opposite ends of the metal pipes of the X-pipe to respective ones of two upstream pipe ends and the two downstream pipe ends of a cat-back exhaust system for a vehicle.
8. The method of claim 7 , further comprising flaring the opposite ends of the metal pipes of the X-pipe to a larger diameter, and inserting the two upstream pipe ends and the two downstream pipe ends of the cat-back system into the opposite ends of the metal pipes of the X-pipe, prior to said welding the opposite ends of the metal pipes of the X-pipe.
9. The method of claim 7 , wherein the metal pipes comprise 304 stainless steel.
10. The method of claim 7 , wherein the pipes are spaced apart by about 0.75 inch at respective ones of the opposing ends.
11. The method of claim 7 , wherein the X-pipe has an overall length of about 14.25 inches.
12. The method of claim 7 , further comprising installing the cat-back exhaust system onto the vehicle with the X-pipe located about 81 inches of pipe length downstream from a catalytic converter of the vehicle.
Priority Applications (1)
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US17/716,145 US20220325652A1 (en) | 2021-04-09 | 2022-04-08 | Automotive engine exhaust system |
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US202163173349P | 2021-04-09 | 2021-04-09 | |
US17/716,145 US20220325652A1 (en) | 2021-04-09 | 2022-04-08 | Automotive engine exhaust system |
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US20220325652A1 true US20220325652A1 (en) | 2022-10-13 |
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US17/716,145 Abandoned US20220325652A1 (en) | 2021-04-09 | 2022-04-08 | Automotive engine exhaust system |
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2022
- 2022-04-08 US US17/716,145 patent/US20220325652A1/en not_active Abandoned
Non-Patent Citations (8)
Title |
---|
Corvette Forum, available at https://www.corvetteforum.com/forums/c5-tech/280908-x-pipe-install-question-weld-on-or-clamp-on.html (Year: 2002) * |
DailyDrivenDeathTraps, Homemade X-pipe | Build your own X-pipe | DIY, YouTube, Published on September 27, 2020, available at https://www.youtube.com/watch?v=zoPumRQq5r8 (Year: 2020) * |
Erik Blume, 304 vs 409 Stainless Steel - bet you didn't know these differences, MAPerformance, Published on September 19, 2019, available at https://www.maperformance.com/blogs/maperformance-blog/77005123-409-and-304-stainless-steel-bet-you-didnt-know-these-deta (Year: 2019) * |
HardHat Engineer, Elbow Manufacturing Process – Pipe Fittings, YouTube, Published February 14, 2017, available at https://www.youtube.com/watch?v=UM-LzCKbtIo (Year: 2017) * |
MBWorld, Posts from 2013, available at https://mbworld.org/forums/c-class-w204/517915-discuss-x-pipe-installation-close-back-front-sounds-better-louder.html ("MBWorld") (Year: 2013) * |
Schoenfeld Elbow, pitstopusa.com, screenshot taken on January 23, 2016, available at https://pitstopusa.com/i-18280014-schoenfeld-elbow-3-diameter-30-bend-5-centerline-radius-2-a-length-7-b-length.html (Year: 2016) * |
The Fab Forums, How To Make A Homemade Stainless Xpipe Exhaust System, YouTube, Published on May 9, 2018, available at https://www.youtube.com/watch?v=jDhhBtchzRA (Year: 2018) * |
The Fabrication Series, TFS: How to Make X Y H Pipes and Transitions, YouTube, Published on April 22, 2018, available at https://www.youtube.com/watch?v=wce_xaiYgV4 (Year: 2018) * |
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